A0340500 (ăn′tē-hē′lē-əm, ăn′tī-)n. The antimatter equivalent of helium.
antihelium
antihelium
[¦an·tē′hē·lē·əm] (atomic physics) The antimatter counterpart of helium, whose atoms each consist of two orbiting positrons and a nucleus composed of two antiprotons and either one or two antineutrons.ThesaurusSeeantimatter